Field-induced pseudo-skyrmion phase in the antiferromagnetic kagome lattice

F. A. GÓMEZ ALBARRACÍN; M. E. VILLALBA; D. C. CABRA; H. D. ROSALES

La Plata

Workshop; Workshop "Topology in Magnetism: Theory Meets Experiments"; 2019

IFLYSIB, PSI

We study the effects of an in-plane Dzyaloshinskii-Moriya interaction under an external magnetic field in the highly frustrated kagome antiferromagnet. We focus on the low-temperature phase diagram, which we obtain through extensive Monte-Carlo simulations. Given the geometric frustration of the lattice, highly non trivial phases emerge. At low fields, lowering the temperature from a cooperative paramagnet phase, the kagome elementary plaquettes form non-coplanar arrangements with non-zero chirality. As the field increases, there is a transition from this ?locally chiral phase? to an interpenetrated spiral phase with broken Z3 symmetry. For a broad range of magnetic fields we identify a pseudo-skyrmion phase (pSkX) in a large portion of the magnetic phase diagram characterized with a topological order parameter, the scalar chirality by triangular sublattice. This phase consists of a crystal arrangement of three interpenetrated no n-Bravais lattices of skyrmion-like textures.